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Practice questions for Chapter 4 1. An unknown substance dissolves readily in water but not in benzene (a nonpolar solvent). Molecules of
what type are present in the substance?A) neither polar nor nonpolarB) polarC) either polar or nonpolarD) nonpolarE) none of these
2. Which of the following is a strong acid?A) HFB) KOHC) HClO4D) HClOE) HBrO
3. All of the following are weak acids exceptA) HCNOB) HBrC) HFD) HNO2E) HCN
4. Which of the following is paired incorrectly?A) H2SO4 – strong acidB) HNO3 – weak acidC) Ba(OH)2 – strong baseD) HCl – strong acidE) NH3 – weak base
5. 1.00 mL of a 4.05 10–4 M solution of oleic acid is diluted with 9.00 mL of petroleum ether, forming solution A. Then 2.00 mL of solution A is diluted with 8.00 mL of petroleum ether, forming solution B. How many grams of oleic acid are 5.00 mL of solution B? (Molar mass for oleic acid = 282 g/mol)A) 5.71 10–6 gB) 1.59 10–5 gC) 2.28 10–2 gD) 1.14 10–5 gE) 5.71 10–4 g
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6. Which of the following aqueous solutions contains the greatest number of ions?A) 400.0 mL of 0.10 M NaClB) 300.0 mL of 0.10 M CaCl2C) 200.0 mL of 0.10 M FeCl3D) 200.0 mL of 0.10 M KBrE) 800.0 mL of 0.10 M sucrose
7. A 74.28-g sample of Ba(OH)2 is dissolved in enough water to make 2.450 liters of solution. How many mL of this solution must be diluted with water in order to make 1.000 L of 0.100 M Ba(OH)2?A) 565 mLB) 177 mLC) 17.7 mLD) 4.34 mLE) 231 mL
8. You have exposed electrodes of a light bulb in a solution of H2SO4 such that the light bulb is on. You add a dilute solution and the bulb grows dim. Which of the following could be in the solution?A) Ba(OH)2B) NaNO3C) K2SO4D) Cu(NO3)2E) none of these
9. When NH3(aq) is added to Cu2+(aq), a precipitate initially forms. Its formula is:A) Cu(NH)3B) Cu(NO3)2C) Cu(OH)2D) Cu(NH3)22+E) CuO
10. Which of the following compounds is soluble in water?A) Ni(OH)2B) K3PO4C) BaSO4D) CoCO3E) PbCl2
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11. When solutions of strontium chloride and sodium sulfate react, which of the following is a spectator ion?A) strontium ionB) chloride ionC) sodium ionD) sulfate ionE) two of these
12. You mix 275.0 mL of 1.20 M lead(II) nitrate with 300.0 mL of 1.85 M potassium iodide. The lead(II) iodide is insoluble. Which of the following is false?A) The final concentration of Pb2+ ions is 0.0913 M.B) You form 128 g of lead(II) iodide.C) The final concentration of K+ is 0.965 M.D) The final concentration of NO3– is 0.965 M.E) All are true.
13. A 3.00-g sample of an alloy (containing only Pb and Sn) was dissolved in nitric acid (HNO3). Sulfuric acid was added to this solution, which precipitated 2.37 g of PbSO4. Assuming that all of the lead was precipitated, what is the percentage of Sn in the sample? (molar mass of PbSO4 = 303.3 g/mol)A) 46.0% SnB) 0.781% SnC) 79.0% SnD) 54.0% SnE) 1.62% Sn
14. You have 75.0 mL of a 2.50 M solution of Na2CrO4(aq). You also have 125 mL of a 1.72 M solution of AgNO3(aq). Calculate the concentration of Ag+ after the two solutions are mixed together.A) 0.00 MB) 0.538 MC) 1.08 MD) 0.088 ME) 0.215 M
15. In the balanced molecular equation for the neutralization of sodium hydroxide with sulfuric acid, the products are:A) NaSO4 + H2OB) NaSO3 + 2H2OC) 2NaSO4 + H2OD) Na2S + 2H2OE) Na2SO4 + 2H2O
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16. Sulfamic acid, HSO3NH2 (molar mass = 97.1 g/mol), is a strong monoprotic acid that can be used to standardize a strong base: A 0.165-g sample of HSO3NH2 required 19.4 mL of an aqueous solution of KOH for a complete reaction. What is the molarity of the KOH solution?A) 0.00170 MB) 8.76 MC) 0.0876 MD) 0.0330 ME) none of these
17. The oxidation state of iodine in IO3– is:A) 0B) +3C) –3D) +5E) –5
18. In the reaction 2Cs(s) + Cl2(g) 2CsCl(s), Cl2 isA) the reducing agentB) the oxidizing agentC) oxidizedD) the electron donorE) two of these
19. Which of the following are oxidation-reduction reactions?I. PCl3 + Cl2 PCl5II. Cu + 2AgNO3 Cu(NO3)2 + 2AgIII. CO2 + 2LiOH Li2CO3 + H2OIV. FeCl2 + 2NaOH Fe(OH)2 + 2NaCl
A) IIIB) IVC) I and IID) I, II, and IIIE) I, II, III, and IV
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20. Which of the following statements is(are) true? Oxidation and reductionA) cannot occur independently of each otherB) accompany all chemical changesC) describe the loss and gain of electron(s), respectivelyD) result in a change in the oxidation states of the species involvedE) A, C, and D
21. Balance the following oxidation-reduction reaction using the oxidation number method: Fe3+ + I– Fe2+ + I2 In the balanced equation, the coefficient of Fe2+ isA) 1B) 2C) 3D) 4E) none of these
22. Consider the following unbalanced oxidation-reduction reaction: Fe2+ + Br2 Fe3+ + Br–
In the balanced equation, the number of electrons transferred isA) 1B) 3C) 2D) 4E) none of these
23. A molecule with an unequal charge distribution is said to be a __________ molecule.
24. Soluble ionic compounds containing the hydroxide ion are called strong __________.
25. A __________ is a substance dissolved in a liquid to make a solution.
26. A __________ electrolyte dissociates to a great extent in an aqueous solution.
27. Selecting from the following reagents, indicate which reagents would be mixed to give Cu(OH)2(s).CuSO4(aq) Fe2(CO3)3(s) NH3(aq)CuCO3(s) FeCl3(aq) Na2SO4(aq)Cr(OH)3(s) H2SO4(aq)
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28. FeCl3(aq) + Na2SO4(aq)
Write balanced equations for each of the processes, choosing from the following substances as reactants:
BaCl2 O2 H2SO4 HNO3C2H5OH H2O Ca(OH)2 KNa2CrO4 KOH Pb(NO3)2
29. Precipitation of BaSO4 from solution
30. Neutralization of sulfuric acid
31. Combustion reaction
32. Dissolution of calcium hydroxide with another reagent
33. Formation of hydrogen gas
34. Select the spectator ions for the following reaction in aqueous solution, AgNO3 + LiI AgI + LiNO3A) Li+(aq), NO3-(aq)B) Ag+(aq), NO3-(aq)C) Li+(aq), I-(aq)D) Ag+(aq), I -(aq), Li+(aq), NO3-(aq)E) Ag+(aq), I -(aq)
ID: A
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Practice questions for Chapter 4Answer Section 1. ANS: B PTS: 1 DIF: Easy REF: 4.1
KEY: Chemistry | general chemistry | solutions | solution formation MSC: Conceptual
2. ANS: C PTS: 1 DIF: Easy REF: 4.2KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | electrolyte | strong electrolyte MSC: Conceptual
3. ANS: B PTS: 1 DIF: Easy REF: 4.2KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | electrolyte | strong electrolyte MSC: Conceptual
4. ANS: B PTS: 1 DIF: Easy REF: 4.2KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | electrolyteMSC: Conceptual
5. ANS: D PTS: 1 DIF: Difficult REF: 4.3KEY: Chemistry | general chemistry | chemical reactions | working with solutions | diluting solutionsMSC: Quantitative
6. ANS: B PTS: 1 DIF: Easy REF: 4.3KEY: Chemistry | general chemistry | chemical reactions | working with solutions | concentrationMSC: Conceptual
7. ANS: A PTS: 1 DIF: Moderate REF: 4.3KEY: Chemistry | general chemistry | chemical reactions | working with solutions | diluting solutionsMSC: Quantitative
8. ANS: A PTS: 1 DIF: Moderate REF: 4.5KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | solubility rulesMSC: Conceptual
9. ANS: C PTS: 1 DIF: Moderate REF: 4.5KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | solubility rulesMSC: Conceptual
10. ANS: B PTS: 1 DIF: Easy REF: 4.5KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | solubility rulesMSC: Conceptual
11. ANS: E PTS: 1 DIF: Moderate REF: 4.6KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | ionic equation | net ionic equation MSC: Conceptual
12. ANS: D PTS: 1 DIF: Moderate REF: 4.7KEY: Chemistry | general chemistry | stoichiometry | stoichiometry calculation | limiting reactantMSC: Quantitative
13. ANS: A PTS: 1 DIF: Moderate REF: 4.7KEY: Chemistry | general chemistry | chemical reactions | quantitative analysis | gravimetric analysisMSC: Quantitative
ID: A
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14. ANS: A PTS: 1 DIF: Moderate REF: 4.7KEY: Chemistry | general chemistry | stoichiometry | stoichiometry calculation | limiting reactantMSC: Quantitative
15. ANS: E PTS: 1 DIF: Easy REF: 4.8KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | acid-base reaction | neutralization reaction MSC: Conceptual
16. ANS: C PTS: 1 DIF: Easy REF: 4.8KEY: Chemistry | general chemistry | chemical reactions | quantitative analysis | volumetric analysisMSC: Quantitative
17. ANS: D PTS: 1 DIF: Easy REF: 4.9KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | oxidation-reduction reaction | assigning oxidation number MSC: Conceptual
18. ANS: B PTS: 1 DIF: Easy REF: 4.9KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | oxidation-reduction reaction MSC: Conceptual
19. ANS: C PTS: 1 DIF: Easy REF: 4.9KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | oxidation-reduction reaction MSC: Conceptual
20. ANS: E PTS: 1 DIF: Easy REF: 4.9KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | oxidation-reduction reaction MSC: Conceptual
21. ANS: B PTS: 1 DIF: Easy REF: 4.1KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | balancing oxidation-reduction equations | oxidation number method MSC: Conceptual
22. ANS: C PTS: 1 DIF: Easy REF: 4.1KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | balancing oxidation-reduction equations | oxidation number method MSC: Conceptual
23. ANS: polarPTS: 1 DIF: Easy REF: 4.1 KEY: Chemistry | general chemistry | solutions | solution formation MSC: Conceptual
24. ANS: basesPTS: 1 DIF: Easy REF: 4.2 KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | acid-base reaction | base definition MSC: Conceptual
ID: A
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25. ANS: solutePTS: 1 DIF: Easy REF: 4.2 KEY: Chemistry | general chemistry | solutions | solution formation | types of solutionsMSC: Conceptual
26. ANS: strongPTS: 1 DIF: Easy REF: 4.2 KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | electrolyte | strong electrolyte MSC: Conceptual
27. ANS: CuSO4(aq) and NH3(aq)PTS: 1 DIF: Moderate REF: 4.6 KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | precipitation reaction MSC: Conceptual
28. ANS: FeCl3(aq) + Na2SO4(aq)PTS: 1 DIF: Easy REF: 4.6 KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | precipitation reaction MSC: Conceptual
29. ANS: H2SO4 + BaCl2 BaSO4 + 2HClPTS: 1 DIF: Moderate REF: 4.6 KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | precipitation reaction MSC: Conceptual
30. ANS: H2SO4 + 2KOH K2SO4 + 2H2O orH2SO4 + Ca(OH)2 CaSO4 + 2H2OPTS: 1 DIF: Moderate REF: 4.8 KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | acid-base reaction MSC: Conceptual
31. ANS: C2H5OH + 3O2 2CO2 + 3H2OPTS: 1 DIF: Moderate REF: 4.9 KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | oxidation-reduction reaction MSC: Conceptual
ID: A
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32. ANS: Ca(OH)2 + 2HNO3 Ca(NO3)2 + 2H2OPTS: 1 DIF: Difficult REF: 4.8 KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | acid-base reaction MSC: Conceptual
33. ANS: 2K + H2O 2KOH + H2
PTS: 1 DIF: Moderate REF: 4.9 KEY: Chemistry | general chemistry | chemical reactions | types of chemical reactions | oxidation-reduction reaction MSC: Conceptual
34. ANS: A PTS: 1 DIF: Easy REF: 4.6KEY: Chemistry | general chemistry | chemical reactions | ions in aqueous solution | ionic equation | net ionic equation MSC: Conceptual
